Tachometer acting weird
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Fleet Mechanic
Joined: Aug 2004
Posts: 1,276
Likes: 7
From: NE Tennessee
Tachometer acting weird
So I was driving along the other night and noticed when sitting at a red light the tach would fluctuate and sometimes bottom out to zero. When I say fluctuate I mean from around idle speed to zero but the actual engine idle would never change. I'm not sure where the tach gets its signal from on a '95 4.0 but since the engine didn't sputter and die, I figure a loose signal wire. At any speed above idle I don't see any fluctuation yet and it doesn't do it all the time. Any clues on the cause of this?
Logistics Pro
Joined: Jun 2009
Posts: 4,819
Likes: 83
From: Cedar Rapids, IA
If your 1995 uses an ignition control module, that would be my first suspect. The ICM in earlier Fords were pretty well-known for causing tachometer issues during early stages of failure.
-Rod
-Rod
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